What's eating my southern cattail?

Southern Cattail (Typha domingensis) is tough but supports a specific community of stem-boring moth larvae, particularly Bellura obliqua, as well as aphids and snout beetles on leaves and stems. In shallow water habitats, muskrats can be serious grazers, excavating rhizomes and weakening stands substantially.

Caterpillars bore into leaves and stems, mining tissue internally and slowing growth; at least eight moth species are recorded feeding on Typha. Remove and destroy heavily infested stems; Bacillus thuringiensis (Bt) spray on foliage can reduce larval populations.

Colonies on leaves and stems draw sap; heavy infestations produce honeydew and attract sooty mould. A strong blast of water removes most colonies; predatory insects such as ladybirds provide natural control in wetland margins.

Feed on rhizomes and shoots, excavating root mats; extensive feeding can lower water levels 2–6 inches and convert solid stands to open water. Protect ornamental plantings with wire mesh barriers around root zones; in natural wetlands, muskrat grazing can be ecologically beneficial as natural thinning.